A common pattern of concurrent systems is for a set of processes/threads/tasks to work independently for a while, then go to a synchronization point where they all wait for each others. For instance, in parallel iterative algorithms, processes can work independently on subareas of a large grid to complete step k, but must wait for each other before starting step k + 1 to commit to the grid all the work done in stage k and to deal with boundary conditions.
Systems like these can be implemented using a synchronizer known as a barrier. When activities reach a barrier, they are blocked there until they are all present (like friends waiting for each others at the door of a restaurant). When the last activity reaches the barrier, the barrier opens and all the activities can proceed with their work. The barrier is automatically reset to block the activities when they return.
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